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POC++ Class 'undeclared identifier"
 

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    <p>This is really frustrating, I've tried multiple variations of my class and constructor, sifted through pages of google results and other questions on this site but I can't figure it out. I believe the error is something simple that I'm overlooking.</p> <p>Error code:</p> <pre><code>1&gt;main.cpp(60): error C2065: 'Student' : undeclared identifier 1&gt;main.cpp(60): error C2146: syntax error : missing ';' before identifier 'newStudent' 1&gt;main.cpp(60): error C3861: 'newStudent': identifier not found </code></pre> <p>student.h</p> <pre><code>#ifndef STUDENT_H #define STUDENT_H class Student { private: static const int SIZE = 7; // initial size of the array int *Students; // Students will point to the dynamically allocated array //int numStudents; // number of students currently in the list int rosterSize; // the current size of the roster int student_id; string name; string classification; public: Student(); // constructor; initialize the list to be empty ~Student(); void set_id(int); void set_name(string); void set_class(string); int print_id(); string print_name(); string print_class(); //void enrollStudent(); //void Print(ostream &amp;output) const; // print the list to output }; #endif </code></pre> <p>student.cpp</p> <pre><code> #include &lt;iostream&gt; #include &lt;string&gt; #include "student.h" #define PROMPT "class&gt; " using namespace std; Student::Student(){ // declared here right? student_id = 0; name = ""; classification = ""; } Student::~Student(){ //delete Student } void Student::set_id( int i ){ student_id = i; } void Student::set_name( string n ){ name = n; } void Student::set_class( string c ){ classification = c; } int Student::print_id(){ return student_id; } string Student::print_name(){ return name; } string Student::print_class(){ return classification; } </code></pre> <p>main.cpp</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include "student.h" #define PROMPT "class&gt; " using namespace std; //**** Implement Error Handling ****\\ enum errorType { UNKNOWN_ERROR, INPUT_ERROR, HANDLER, NUM_ERRORS }; // error messages string errorMessage[NUM_ERRORS]= { "Unknown Error\n", "Input Error\n", }; // error handler void handleError(errorType err) { if(err &gt; 0 &amp;&amp; err &lt; NUM_ERRORS) cout&lt;&lt; "Error: "&lt;&lt; errorMessage[err]; else cout&lt;&lt; "Error: "&lt;&lt; errorMessage[UNKNOWN_ERROR]; } //**** END Error Handling ****\\ void getInput() { int id; string n, c; cin&gt;&gt;id&gt;&gt;n&gt;&gt;c; //cout&lt;&lt;id&lt;&lt;"-"&lt;&lt;n&lt;&lt;"-"&lt;&lt;c&lt;&lt;endl; Student newStudent(); //****WORK DAMN U! //set_id(id); //print_id(); return; } int main() { //Student newStudent(); /* &lt;-- why doesn't this work?!*/ string input = ""; bool finished = false; cout&lt;&lt;PROMPT; // prompt the user while(!finished) { if(input!="") cout&lt;&lt;PROMPT; cin&gt;&gt;input; if(input=="enroll") { cout&lt;&lt;PROMPT&lt;&lt;"Enroll student:"&lt;&lt;endl; getInput(); } else if(input=="drop") { cout&lt;&lt;PROMPT&lt;&lt;"Enter ID:"&lt;&lt;endl; } else if(input=="roster") { cout&lt;&lt;"This will print formatted list of students"&lt;&lt;endl; } else if(input=="quit") { finished=true; } else handleError(errorType(1)); } } </code></pre> <p>Just as a note, my professor said adding #include student.h<br> to my main.cpp would fix my issue. OBVIOUSLY NOT because I included it in my student.cpp SO THANKS. ಠ_ಠ</p> <p>tl;dr here is a smaller barebones version that gets same errors:</p> <pre><code>#include&lt;iostream&gt; #include&lt;string&gt; #define PROMPT "class&gt; " using namespace std; class Student { private: int student_id; string name; string classification; public: Student(); // constructor ~Student(); void set_id(int); int print_id(); }; Student::Student(){ student_id = 0; name = ""; classification = ""; } Student::~Student(){ //delete Student } void Student::set_id( int i ){ student_id = i; } int Student::print_id(){ return student_id; } void messenger(){ int id; Student newStudent(); cin&gt;&gt;id; //this will drop the name and class newStudent.set_id(id); newStudent.print_id(); return; } void main() { //Student newStudent(); string input=""; bool finished=false; cout&lt;&lt;PROMPT; // prompt the user while(!finished) { if(input!="") cout&lt;&lt;PROMPT; cin&gt;&gt;input; if(input=="enroll") { cout&lt;&lt;PROMPT&lt;&lt;"Enroll student:"&lt;&lt;endl; messenger(); //cin&gt;&gt;input; //newStudent.enroll(input ); } else if(input=="drop") { cout&lt;&lt;PROMPT&lt;&lt;"Enter ID:"&lt;&lt;endl; } else if(input=="roster") { cout&lt;&lt;"This will print formatted list of students"&lt;&lt;endl; } else if(input=="quit") { finished=true; } } } </code></pre>
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    1. CODid you try your professors solution? Did it work? What `#include` does it to literally include the specified file into the source, with the result being a file containing both the included files and the source. If it's included in one source file, then it's not automatically included in another. If `"student.h"` is not included in `main.cpp`, then how would the functions in `main.cpp` know anything about the stuff declared in `student.h`?
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      1. USSome programmer dude
    2. COright, I understand the professor's statement now. at first I thought it was redundant to include it in both .cpp files, but this doesn't fix the issue. Are my constructor/class improperly defined? edit: yes, tried professors solution
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    3. COBTW, class is a reserved word in C++. Are you sure that #define PROMPT "class> " will not cause issues?
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      1. USRichard Lalancette
 

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